This Austin Air Replacement Filter Pack includes all 4 component filters that originally arrived with the Allergy Machine Air Purifier (HM405 series). Replacement time frames can vary depending on whether the Allergy Machine is filtering heavy particles and gases, but typically, the replacement time period is approximately every five years. The pre-filters can be purchased separately if you prefer to replace these filters more often. When purchasing the Replacement Filter Pack or the pre-filters, select White replacements if your Austin Air purifier is White or Sandstone or Black replacements if your purifier is Black. The exterior layer of pre-filter can be seen through the air purifier’s grille and therefore, choose the replacement filter according to the color of your purifier. Although this Filter Replacement Pack is designed for the Allergy Machine, it will fit any Standard size Austin Air Purifier (such as the HealthMate or HealthMate Plus). Junior Filter Packs sold separately.

The Austin Air HealthMate Allergy Machine features 4 stages of filtration, and each of these stages are included in the Filter Replacement: